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Research Article

Room-temperature ligancy engineering of perovskite electrocatalyst for enhanced electrochemical water oxidation

Junchi Wu1,§, Yuqiao Guo1,§, Haifeng Liu3, Jiyin Zhao1, Haodong Zhou1, Wangsheng Chu2, Changzheng Wu1( )
Hefei National Laboratory for Physical Sciences at the MicroscaleCollaborative Innovation Center of Chemistry for Energy Materials (iChEM)and CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefei230026China
National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei230026China
Analytical and Testing CenterSouthwest University of Science and TechnologyMianyang621010China

§ Junchi Wu and Yuqiao Guo contributed equally to this work.

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Abstract

Perovskite oxides are significant candidates to develop electrochemical catalysts for water oxidation in consideration of their high catalysis capacity, low costing and excellent stability. Rational design of coordination structure and overcoming poor electronic transport are regarded as critical factors for outstanding perovskite-based oxygen evolution reaction (OER) catalysts. Herein, we report a mild chemical oxidation method to realize ligancy engineering from strongly-correlated brownmillerite Sr2Co2O5 to perovskite phase Sr2Co2O55, along with abundant oxygen vacancies formation and greatly boosted electric conductivity, which helps to form the active species of Co hydroxide/oxide on the surface of catalysts. The coupling effect of catalytic kinetics and unimpeded electronic movement brings high OER activities in Sr2Co2O55with a low onset potential and a small Tafel slope. Our work not only displays in-depth understanding into the relationship among catalysis performance and multiple physical degrees of freedom, but also paves a new path to develop high-efficient electrochemical catalysts.

Keywords

perovskite oxidesligancy engineeringoxygen evolution reactionelectrocatalysts

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Nano Research
Volume 12 Issue 9,
September 2019
Pages 2296-2301
DOI: 10.1007/s12274-019-2409-5
Cite this article:
Wu J, Guo Y, Liu H, et al. Room-temperature ligancy engineering of perovskite electrocatalyst for enhanced electrochemical water oxidation. Nano Research, 2019, 12(9): 2296-2301. https://doi.org/10.1007/s12274-019-2409-5
Topics:
Catalysis Cobalt compoundsCoordination reactionsElectrocatalystsOxidationStrontium compounds
Part of a topical collection:
NR45 Awards in NanoEnergy, 2019

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Received: 29 January 2019
Revised: 20 March 2019
Accepted: 08 April 2019
Published: 25 April 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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